job
A task performed by a computer system. For example, printing a file is a job. Jobs can be performed by a single program or by a collection of programs.
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- join
In relational databases, a join operation matches records in two tables. The two tables must be joined by at least one common field. That is, the join field is a member of both tables. Typically, a join operation is part of a SELECT query.
- journaled file system
A file system in which the hard disk maintains data integrity in the event of a system crash or if the system is otherwise halted abnormally. The journaled file system (JFS) maintains a log, or journal, of what activity has taken place in the main data areas of the disk; if a crash occurs, any […]
- Joystick
)A lever that moves in all directions and controls the movement of a pointer or some other display symbol. A joystick is similar to a mouse, except that with a mouse the cursor stops moving as soon as you stop moving the mouse. With a joystick, the pointer continues moving in the direction the joystick […]
- jukebox
A device that stores numerous CD-ROMs and uses a mechanical arm, carousel or other device to bring the disk to an optical station for reading and writing. A jukebox can reside in a PC or be an external device. Some of the larger jukeboxes hold as many as 500 disks and have multiple readers and […]
- jumbo frame
Jumbo frames are large IP frames used in high-performance networks to increase performance over long distances. Jumbo frames is the term used most often to mean 9000 bytes for Gigabit Ethernet but can refer to anything over the IP MTU (Maximum Transmission Unit) which is 1500 bytes on an Ethernet.